installing rolled roofing over shingles

Installing Rolled Roofing Over Shingles A Comprehensive Guide

Installing rolled roofing over existing shingles is an economical and effective solution for homeowners looking to upgrade or repair their roofs without the expense and effort of a complete roof replacement. Rolled roofing is a popular choice for sheds, garages, and low-slope roofs due to its affordability, ease of installation, and durability. This article will guide you through the process of installing rolled roofing over shingles, covering the necessary materials, preparation steps, and installation techniques.

Materials Needed

Before starting your project, ensure you have the following materials on hand

1. Rolled roofing Available in various colors and materials, choose a high-quality product suited for your climate. 2. Roofing nails Use galvanized or stainless steel nails to prevent rust and ensure longevity. 3. Roofing cement This will help seal seams and edges for added waterproofing. 4. Underlayment (optional) While not always necessary, installing a layer of underlayment can provide extra protection. 5. Utility knife For cutting rolled roofing. 6. Measuring tape To ensure accurate measurements. 7. Ladder For accessing the roof. 8. Safety equipment Including gloves and a harness if necessary.

Preparation Steps

1. Inspect the Existing Roof Before beginning, assess the condition of your current shingles. Make sure there are no significant damages such as curling, lifting, or rotting. The underlying structure should be intact. Minor issues can typically be repaired, but extensive damage may necessitate further repairs or even a full roof replacement.

2. Clean the Roof Surface Remove any debris, dirt, or moss from the surface of the shingles. A clean surface is crucial for proper adhesion and to prevent trapped moisture that can lead to mold growth.

3. Level the Surface Check for any shingles that are loose or raised and secure them down. If there are any protrusions like nails or screws sticking up, make sure these are countersunk to create a smooth, flat surface.

4. Underlayment Installation (Optional) If using underlayment, roll it out across the roof, overlapping the edges by at least 2 inches. Secure it with roofing nails every few feet. This added layer can help with insulation and can provide an extra waterproof barrier.

1. Starting at the Bottom Begin laying the rolled roofing at the lower edge of the roof. Unroll the material and cut it to the needed length. Leave a couple of extra inches over the edge to allow for trimming later.

2. Secure the First Strip Position the first roll so that it overlaps the edge of the roof by a couple of inches and secure it in place using roofing nails. Space the nails about 6-8 inches apart, ensuring that they penetrate the shingles beneath.

3. Continue Laying Rolls Roll out additional strips of rolled roofing, ensuring that each new strip overlaps the previous one by at least 4 inches. Again, use nails every 6-8 inches along the top edge and at the seams. Be cautious while working on the roof, taking necessary safety precautions.

4. Sealing the Seams Once the entire roof is covered, it’s time to seal the seams. Apply roofing cement generously at all overlaps and joints. Using a trowel, ensure that the cement is worked into the seams effectively to create a waterproof seal.

5. Trimming Edges After everything is secured and sealed, use a utility knife to trim any excess rolled roofing at the edges for a clean finish.

6. Final Inspection Conduct a final inspection of your roof to ensure that all nails are secured and that seams are sealed properly. Look for any areas that might need additional roofing cement.

Conclusion

Installing rolled roofing over shingles can be a productive and cost-effective project for many homeowners. By following these steps and taking the necessary precautions, you can achieve a durable and weather-resistant roof that enhances the protection of your home. Remember, while DIY projects can be fulfilling, don't hesitate to consult or hire a professional if you're uncertain about any part of the process. With the right materials and careful execution, your rolled roofing installation can provide lasting benefits for years to come.